Roof aquifer water abundance evaluation: a case study in Taigemiao, China
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ORIGINAL PAPER
Roof aquifer water abundance evaluation: a case study in Taigemiao, China Qiang Wu 1 & Ke Xu 2 & Wei Zhang 3 & Zhao Wei 1
Received: 11 January 2016 / Accepted: 24 May 2017 # Saudi Society for Geosciences 2017
Abstract To ensure safe mining of the Taigemiao no. 3 mine field in Inner Mongolia, China, it is very important to make clear the roof aquifer water abundance distribution feature. On the basis of collecting the main controlling factors of aquifer water abundance from the geological and hydrogeological prospecting data of the study area, the no. 2 coal seam roof aquifer water abundance of Taigemiao no. 3 mine field was analyzed and evaluated using three methods. The first method is analytic hierarchy process (AHP)-type water-richness index method (AHP-type WIM) which is commonly used. But AHP is relatively subjective, so we trying to use a more objective method which is weighed gray relational degree method (WGRDM); this method mainly used pure data analyzing, it is better than AHP-type WIM but still not perfect, so the comprehensive weighted method (CWM) is put forward by adopting the advantage of the former two methods. In order to assess the accuracy rate of the three methods quantificationally, the evaluation results of the three methods are compared respectively with the measured unit water inflow which can directly reflect the aquifer water abundance, which shows that the WGRDM is more
* Ke Xu [email protected]
1
College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
2
College of Geology and Environment, Xi’an University of Science and Technology, No.58 Yanta Road, Bielin District, Xi’an 710054, China
3
Northwest Nonferrous Survey Engineering Co., Ltd, Xi’an 710054, China
accurate than AHP-type WIM, and the CWM is more scientific and accurate in both weight calculation and water abundance grading. The superiority of CWM is more obvious when there are too many evaluation factors. Keywords Water abundance . Evaluation method . Gray method . Comprehensive weighting . Geographic information system (GIS)
Introduction Coal mining tunnel construction will inevitably expose, damage, or disturb the roof and floor aquifer. Although it will not induce water inrush when the process exposes the poor water abundance zone, it is more possible to cause serious water burst in the rich water abundance zone during mining (Wu and Wang 2006; Wu et al. 2017; Wang et al. 2017; Jiang et al. 2017). Therefore, accurate and reliable evaluation of aquifer water abundance distribution feature is essential for safe coal production and management (Wu et al. 2004; Wu 2014; Ma et al. 2017). Many scholars have researched on the methodology of aquifer water abundance evaluation. Wu established the aquifer water abundance evaluation model using Bwater-richness index method^ (WIM) based on GIS information union function, which was used to evaluate the no. 4 coal seam roof aquifer water abundance distribution features of Pingshuo coal mine (Wu et al. 2011a).
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